Improved millstone-dresser



UNITED STATES PATENT GEETCE.

ZENUS G. HURD, OF ELDORADO, IOVA.

IMPROVED MlLLSTONE-DRESSER.

Specification forming part of Letters Patent No. 37,097 dated December9, 1862.

To all whom it pta/y concern.-

Be it known that l, ZENUs G. HURD, of Eldorado, in the county of Fayetteand State of Iowa, have inventeda newand Improved Millstone-Dresser; andI do hereby declare that the following is a full, clear, and exactdescription of the same, reference being had to the accompanyingdrawings, forming a part of this specilicat'ions, in which- Figure lrepresents a longitudinal vertical section of my invention, the plane ofsection being indicated by the line a' m, Fig. 2. Fig. 2 is a plan ortop view of the same. Fig. 3 isa detached sectional elevation of thepick and its eye or socket.

Similar letters of reference indicate corresponding parts in theseveralfigures.

This invention consists in the arrangement ofa V-shaped seat in theinterior of the eye, which is to receive the pick, in combination with atriangular wedge, in such a manner that the eye is iit to accommodateitself to picks of different shape and size.

It consists, also, in the arrangement of a hinged holder in combinationwith the triplever in such a manner that the position of the pick inrelation to the surface of the lever or stone can be adjusted atpleasure.

It consists, finally, in the arrangement of a spring-lever incombination with the trip-lever in such a manner that by the action ofsaid spring-lever the force of the blow can be regulated at pleasure.

To enable those skilled in the art to make and use my invention, I willproceed to describe its construction and operation with reference to thedrawings.

The trip-leverA, which carries the pick B, is l'ulcrated on a pivot, a,which is :firmly inserted into an arm, C. The lower end of this armslides on a rod, b, which extends transversely across the frame D, andits middle part or hub forms the nut for the screw c, which serves toimpart to said arm a laterallysliding motion from one side of the frameto the other. This screw has its bearings in suitablejournal-boxes, d,on the top of the frame D, and it is operated by a bevel-wheel, E, whichis firmly keyed to its end. This bevelwheel gearsinto a similar wheel,E', keyed to a shaft, c', that runs at right angles to the screw c. Thisshaft bears a bevel-pinion, E, and two wheels, F F, which rotate withand slide in a longitudinal direction on the driving-shaft f, arealternately thrown in gear with said pinion. By this arrangement themotion of the screw c, and with it that of the arm C, is reversed, andthe pick can be made to travel over the surface of the stone in eitherdirection. The bevel-wheels F F are connected by a common hub, and theirposition is governed by a :hand-lever, f', the end of which catches intoa groove in the hub ofthe wheels F F. This lever is pivoted to the topof the frame D, and it is retained in the desired position by aserratedbar, d, with three notches one to retain the hand-lever when the wheel Fis in gear with the pinion E", and one to retain it when the bevel-wheelF is in gear with said pinion, vand the middle notch to retain the leverwhen both wheels are thrown out of gear. A vibrating motion is impartedto the trip-lever A by a trip-wheel, F, with three (more or less)tappets, c, which are alternately brought in contact with the tail endof the trip-lever. This trip-wheel is secured to the driving-shaftfinsuch a manner that it is compelled to rotate with the same, at the sametime being at liberty to slide on it in a direction parallel to itsaxis. A rod, g, the forked end of which catches in a groove, h, in thehub of the trip-wheel, extends from the arm C, so that if alaterallysliding motion is imparted to said arm in either direction bymeans of the screw c the trip-wheel is compelled to partake of thismotion and to maintain always its proper working position in relation tothe trip-lever A. The shaft E,which carries the trip-wheel F, is rotatedby means of a balance wheel or pulley, G, to which motion may beimparted by hand or any other suitable power. Said shaft has itsbearings in journal-boxes h on the frame D, as clearly shown in Fig. 2of the drawings. The frame D is supported by legs i fi', which rest onsills j, and the lower hooked ends of which catch under anged guidesj,so that a longitudinal sliding motion can be imparted to said frame withall its appendages. A screw, k, which screws into a standard, Z, risingfrom one of the cross-bars m,which connects the sills j and which isfastened in a cross-bar, a, connecting the legs z" at the rear end ofthe frame, serves to impart to said frame, together with all themachinery attached to it, a longitudinal motion. By the combined actionofthe two screws c and 7c the pick can be carried over the entiresurface of the stone, which at the same time receives the desiredoscillating motion by the action of the trip-wheel F on the lever A. Thepick B isinserted into aholder, H, which is pivoted to the front end ofthe trip-lever A. rlhis holder is provided with an eye, o, one side ofwhich forms aV-shaped seat, p, for a triangular wedge, p', whereby Saideye can be accommodated to the varying shape and size of differentpicks. A cap. g, which is fastened to the lever A and holder H by meansof screws g', and the inner surface of which is made rough and providedwith le-teeth, retains the pick firmly in its place. By means of theholder H the operator is enabled to bring his pick in the desiredposition for furrow/ing or dressing burrs. The force of the plow isregulated by the handlever I, which is pivoted to the upper end of thearm C, and which connects by means-of a spring, of', with the trip-leverThis spring is rigidly fastened to the handlever, and it bears in anotch, s, in the upper surface of the triplever. It is obvious that byraising the rear end of the hand-lever I the force with which the springr bears down on the trip-lever is increased, and vice versa, so that theoperator has it in his power to make the pick strike with whatever forcehe desires.

Having thus fully described my invention, what l claim as new, anddesire to secure by Letters Patent, is

l. The arrangement of the hinged holde H in combination with the trip-lever A and pick B, constructed and operating substantially as and forthe purpose specied.

2. rlhe arrangement of the V-shaped seat p and triangular Wedge p incombination with the holder H and pick B, as set forth.

3. The arrangement of the spring-leverl in combination with thetrip-lever A, as and for the purpose described.

ZENUS G. HURD.

Witnesses:

A. C. JoNns, E. F. THOMPSON.

